Trolley



Aug. 12 1924.

P. L. MARDIS TROLLEY.

Filed Feki. 4. 1921 .5 RM w W M w L ATTORNEY Patented Aug. 12, 1924.

UNITED STATES,

} 1 1,504,569 PATENT OFFICE.

PAUL L. MABDIS, or swlssv La, PENNSYLVANIA, ASSIGNOB. 'ro -.WESTINGHOUSE ELECTRIC a MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA.

TROLLEY.

Application filed -I'ebruary 4 1921. Serial No. 442,389.

To all wlzov'n its-nay concern: Be it-known that I, PAUL L. Manors, a

citizen of-the United States, and a resident of Swissvale, in the county of Allegheny 6 andState of Pennsylvania, have invented a new and useful Improvement in Trolleys, of which the following is a specification.

My invention. relates to trolleys for ,use in electrically-propelled vehicles and par- 10 ticularly to means forlocking a pantograph or other trolley frame in its retracted position and'discon'necting it from a conductor to, a transmission system within the vehiclei l v The object of my invention is to provide means whereby a pantograph frame may be lockedin its inoperative position and, at the same time, be automatically isolated from live conductors and be rendered safe a ainst the results of accidental engagement with live conductors.

Heretofore, in cutting out a pantograph frame,-it has been locked in retracted position by means of chains or other retaining devices, but, if the conductor were not first disconnected from the frame or, if, while the frame was locked down, the conductor should be connected to the frame, the chains would be burned and fall apart. Another objection arose from the danger to workmen engaged in repairing the frame, as a result .of shock'in case the lead were inadve'rtently connected to the frame or accidental engagement took place-between a live conductorand the frame;

I provide a disconnectingv switch for breakin the connection between the pantograph rame and the conductor which is part 'of the system located on the car or train of cars and utilizethe movable memvice for the frame and also as a means for connectin it to a ground terminal. .Thus, the act of the conductor and also automatically connects it to a ground terminal to 'protect against the results of accidental engagement 'with a live conductor.

My apparatus is illustrated in panying drawing, wherein- Figs. 1 and 2 are side elevational and plan. views, res ectively, of a portion of a pantograph ranie having my apparatus applied thereto.

retracted position, and the blade 6 is swung ber of this switeh as a holding-down? de locking the frame automatically. insures against inadvertent connection of,

the accom A frame 3 may be ofany desired .construction and supported on a car roof'4 in the usual manner.

The frame 3 serves to conduct currentfrom a supply conductor (not shown) through a terminal 5' and switch member 6 to a terminal 7 and a conductor 8 that conveys thecurrent to the motors of the carorto another car, in the usual manner. A ground terminal 9 is -provided'for engagementby the switch member 6, when in the. full-line position illustrated in the drawing. The terminals Sand 7 are mounted on insulators 10 and 11, respectively.

A bar 12 is secured to the frame 3and eirtends laterally with respect thereto, in a horizontal plane. When the frame 3 is in its retracted position, the bar 12 lies below the position occupied by the switch blade 6,

as illustrated in the drawin -When the Switchblade 1s thrown to the position indicated in broken and dotted lines in Fig. 1, the bar 12 is released and the frame 3 is free to rise to its operative position. If, for .any reason it is desired to cut out the frame, it is brought to: its

to thefull-line position illustrated intlie drawin thus disconnecting the frame from' t e conductor 8 andconnecthg it to the ground. A. latc'hing dev'ice 13 is provided to hold the blade innlocke'd position, with respect to the frame and to pre vent movement thereof to its advanced position.

Fro1n the foregoing, it will be seen that,

so long as the 'frame is maintained in its retracted position, there is no danger of its 7 being inadvertently connected to the motor conductor and that theground connection l serves as a further protection to the device and to'theworkmen employed thereon.

variou's 'modifications maybe made in the construction without de arting from the scope of the. same, as de ed in the accompanying claims.

' I claim as my invention '1. Inrcombinatioma pantograph frame adapted, when in advanced position, to conduct current from; aline conductor to a second conductor, a switch member for connecting the frame to the second conductor and a baron said'frame, said switch being adapted to retain said 'bar and frame in retracted position.

2. In combination,- a pentograph'-irume 1 4, The combination with a pentograph adapted, when in advanced position, to eonframe, of a. disconnecting switch adapted, ,duct current from a line conductor to a. when-in one position, to'serve'es a connectseoond conductor, a. switch -member jforr ing member between the pantogmph time 25 5 connecting the frame to the second conandja conducting member" and, when in du'otor, said switch membervbeing' adapted, another position, to maintain the frame in when in open position with respect .to retracted. positionand to connect it to a. the second conductor, to serve as a re ground terminal. i p 1 3. taining device for the frame, and a 5. The comb' ation with an electriccura0 ground terminal in position to be enrent collector for vehicles, ofmeans for geged by; the switch member when said holding the collector in inoperative position member is being utilized to hold the frame with respectto a supplyoircuit, the said in retracted position. means serving also to connect the collector 3. The combination with a pantograpn to a; ground terminal .and to disoonnect it 85 frame, of a. disconnectifig switch -adapted, irom the wiring fsystem of the vehicle, when when in one position; to serve as a connectsaid, collector is brought to inoperative ing member between the pantograph' 'irafiie positionij L I and a concluctin member end, when in anr In testimony whereof, I have hereunto other position,-% retracted position and edditionelmeans for ery 1921,;

locking said switch in said second position;

' PAUL L. MAR-DIS.

o maintain the ireme in snhscribedmy, name th'is 19th day of Jane 40 1 

